Answers

2015-02-15T17:58:54+05:30
Here in the given A.P the first term a , = -4/3
an = 11/3   and d = 1/3

an = a + ( n - 1 ) d
11/3 = -4/3 + ( n - 1 ) 1/3
5 = n/3 - 1/3
5 + 1/3 = n/3
16/3 = n/3
16 = n

Now the middle term = n/2 , n/2 + 1
= 8th term and 9th term.

a + 7d + a + 8d 

2a + 15d
 2(-4/3) + 15(1/3)

-8/3 + 5

-8 + 15
    3 

= 7/3

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2015-02-15T19:38:26+05:30
7/3 is the middle most sum of the a.p the 8th and 9th terms are middle most terms

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